I'm not really a fan of this idea because if you saw that someone had spent a lot of money on the server, they might be pressured into doing store trades - and also some things have been bought on the store under my name, for example, but I have never spent anything on the server, and it was just a store trade. Besides, it feels like an invasion of privacy to reveal how much everyone has spent on the server, as some people may not want a number out there.